Associated model numbers: MCT-3

The MCT-3 digital transmitters are wireless radio controls designed for use with automatic garage door and gate openers.

Each of the three transmitter buttons will send a unique code when pressed. One button can be used to activate the individual's garage door opener, a second button can operate an access gate, a third button can activate an additional garage door operator or most Linear 318Mhz wireless receivers.

MegaCode transmitters and receivers do not contain a typical "coding switch".  Each transmitter is permanently coded at the factory. The receiver is programmed by "learning" a transmitter's unique digital code. The receiver will activate only from the "memorized" transmitters.

The transmitters are powered by two type 2032 lithium "coin-cell" batteries. They should last 3 years with normal use. The red indicator on the face of the transmitter will glow when the unit is activated. If the indicator lights dimly, or not at all when transmitting, the batteries need to be replaced. To conserve battery life, an internal timer limits the transmission duration to 10 seconds if a transmitter button is held down.

*************   WARNING   *************

            Moving Door can cause serious injury or death.

·         DO NOT install transmitter unless the door operator’s safety reverse works as required by the door operator’s manual.

·         Wall control must be mounted in sight of door, at least 5 feet above floor and clear of moving door parts.

·         Keep people clear of opening while door is moving.

·         DO NOT allow children to play with the transmitter or door operator.

If safety reverse does not work properly:

·         Close door then disconnect operator using the manual release handle.

·         DO NOT use transmitter or door operator.

·         Refer to Door and Door Operators Owner’s Manuals before attempting any repairs.

            Electrical Shock can cause serious injury or death.

·         Power cord must be unplugged before attaching any wires,

·         Be sure wire ends do not touch each other or other terminals.

If you have questions or if you need a manual, contact the distributor or manufacturer of the operator.


MDR/MDRNR/MDR2 program button and LED location.  Locate the program button and LED on the side of the receiver case.

MDRM/MDRM2 program button and LED location.  Locate the program button and LED on back of the receiver case.

Program Receiver.  Momentarily press the receiver's program button.  The red programming LED will light if there's room in the receiver's memory for another transmitter (10 max per receiver).  The LED stays on for about 5 seconds.  A TRANSMITTER MUST BE ENTERED WHILE THE LED IS ON.  Press the desired transmitter button.  The LED will flicker indicating that the receiver has accepted the transmitter.  NOTE:  Be sure to press the receiver program button for less than 2 seconds (any longer may erase the memory).

Add Additional Transmitters.  Repeat the above step for each transmitter used with this receiver.  BE SURE TO PRESS THE RECEIVER'S PROGRAM BUTTON EACH TIME A NEW TRANSMITTER OR A DIFFERENT TRANSMITTER BUTTON ON A MULTI-BUTTON TRANSMITTER IS PRESSED.  If the LED doesn't come on when the receiver's program button is pressed, the receiver's memory is full.  Use the erase function to remove transmitters from the receiver's memory.

ERASING RECEIVER MEMORY.  Transmitters may be erased from the receiver's memory by pressing and holding the receiver's program button for 5 seconds or more.  After the LED stops blinking all transmitters are erased.  Start again with PROGRAM RECEIVER.

After programming, test the transmitter from various locations. Be sure the door or gate areas are clear. Activate the transmitter and verify that the receiver triggers the operator(s).


1.Twist a dime in slot to open case.

2. Lift off the top of the case.

3. Carefuly remove the circuit board. NOTE: The circuit board will fit only one way into the case. Align the plastic post in the case with the hole in the circuit board.

4. Remove old batteries and dispose of them properly.

5. Insert two new type 2032 batteries PLUS (+) side up then reassemble unit.


Linear radio controls provide a reliable communications link and fill an important need in portable wireless signaling. However, there are some limitations which must be observed.

For U.S. installations only. The radios are required to comply with FCC Rules and Regulations as Part 15 devices. As such they have limited transmitter power and therefore limited range.

A receiver cannot respond to more than one transmitter signal at a time and may be blocked by radio signals that occur on or near their operating frequencies, regardless of code settings.

Changes or modifications in the device may void FCC compliance.

Infrequently used radio links should be tested regularly to protect against unidentified interference or fault.

A general knowledge of radio and the vagaries should be gained prior to acting as a wholesale distributor or dealer, and these facts should be communicated to the ultimate user.


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Comments: - Owned by 1st Garage Door Openers, Inc., an independent family owned and operated business serving the Garage Door and Garage Door Opener Industry since 1981. Providing excellent customer service and assistance for over 25 years. We are a discount reseller of garage door opener remotes, repair parts, keyless entry and gate operator controls for your home, business, or gated community. We carry parts for the following garage door openers: Lift-Master, Chamberlain, Sears Craftsman, Access Master, Sears Best Craftsman, Sears Automatic Door Opener, Master Mechanic, Security +, Formula 1, Garage Master, Billion Code, LiftMaster Professional, Estate Series, Premium Series, Contractor Series, Power Driver, Whisper Drive, Genie, Alliance, Norelco, Blue-Max, Lift-A-Door, Pro Max, Hercules, Stealth, Excelerator, Intellicode, Genie Pro, OverDrive, Python 2, Signature, Phantom, Legacy, Medallion, CodeDodger, Overhead Door, Genie Shop Vac, Stanley, Vemco, Quiet Glide, SecureCode, Lightmaker, Innovative Products, Whistler, U-Install, Popular Mechanics, Allister, Allstar, Pulsar, MVP, Challenger, GTO, All-O-Matic, Electrolift, Westinghouse, AM/11, Linear, Access Pro, Moore-O-Matic, MegaCode, Delta 3, MultiCode, Heddolf, ESP Micom, Intercontinental Dynamics, Crusader, Wayne Dalton, iDrive, Door Master, Quantum, Classic Drive, Tec Key, Martec, Monarch, Telectron and other garage door openers, and gate operators. Brand names of Garage Door openers are registered trade names of the respective entities and are only used for reference.